Awesome! Easily my favourite so far.
Should this be considered a win? Been waiting here for lava to catch me up for almost five minutes now but the bar is still showing empty.
I have only two big issues with the game really. The first and the major one being the difficulty. It doesn't scale at all? So once you get the ropes, you can go on forever. The only even remotely hard section was that long stretch of corridor where you need to hit the red enemies but obviously you can even skip that and go with the safe and not that much slower right side route.
Easiest move would be to make the lava speed increase over time so that it would pretty much become impossible at some point. That would offer some real test of skills then. And you could also randomly mirror the "rooms" to get more variation without any additional designs. Getting hit on spikes could get punished more and more the more you hit em too.
Oh wow, lava is actually catching up to me now...
The second gripe was the control layout. Would have been million percent better if the rocket would be the same button as jump. So just like a floaty double jump. And I hate that you decided to bind the rocket to mouse of all things. Making an platformer and arbitarily binding one button to mouse when you don't need its cursor for anything is just weird. I really don't understand why people go for such layouts. Most people are right handed and even for lefties, I don't see why you would want to play pretty much with just a single hand.
The game looks and sounds great! There was some minor sprite tearing but that wasn't a big deal. And I would have wanted to see more juice too. A game like this is just screaming for screen shake!
Anyways, awesome job!